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font: 80% verdana, arial, sans-serif;
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margin: 0;
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list-style-type: none;
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#menu {
position: absolute;
top: 0;
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dl#menu {
width: 15em;
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<dl id="menu">

		<dt onclick="javascript:OpenMenu();"><a href="#">Menu 1</a></dt>
			
		<dt onclick="javascript:OpenMenu('smenu2');">Menu 2</dt>
			<dd id="smenu2">
				<ul>
					<li><a href="#">Sous-Menu 2.1</a></li>
					<li><a href="#">Sous-Menu 2.2</a></li>

					<li><a href="#">Sous-Menu 2.3</a></li>
				</ul>
			</dd>	

		<dt onclick="javascript:OpenMenu('smenu3');">Menu 3</dt>
			<dd id="smenu3">
				<ul>
					<li><a href="#">Sous-Menu 3.1</a></li>
					<li><a href="#">Sous-Menu 3.1</a></li>

					<li><a href="#">Sous-Menu 3.1</a></li>
					<li><a href="#">Sous-Menu 3.1</a></li>
					<li><a href="#">Sous-Menu 3.1</a></li>
					<li><a href="#">Sous-Menu 3.1</a></li>
				</ul>
			</dd>

		<dt onclick="javascript:OpenMenu('smenu4');">Menu 4</dt>
			<dd id="smenu4">
				<ul>
					<li><a href="#">Sous-Menu 4.1</a></li>
					<li><a href="#">Sous-Menu 4.1</a></li>
				</ul>
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</dl>